Item Type: Mobile phone lens Material: Aluminum alloy, optical glass Weight: Approx. 437g/15.4oz Optical Structure: 11 groups and 11 pieces Equivalent Focal Length: 50mm/2in Optical Distortion: 3% Focusing Mode: Manual focusing 15-20mm/0.6-0.8in Lens Interface Thread Specification: 17mm/0.7in Package List 1 x Mobile Phone Lens 2 x Protective Cover(Installed) 1 x Clip 1 x Instructions 1. The metal clip corresponds to the main camera of the mobile phone2. The inverted image taken directly through the 50mm lens needs to be used in combination with the software 1Applicability: The lens interface adopts a 17mm thread design, which can be used for most smart phones with a metal mounting clip, or you can buy a special phone case with a 17mm thread mounting aperture. 2Clear Image: The mobile phone lens adopts premium optical glass, 11 groups and 11 pieces of optical structure design, BAK4 prism and manual focusing, which has high transmittance, clear image, and experience the fun of SLR. 3Aluminum Alloy Lens Barrel: The lens barrel is made of premium aluminum alloy, which has fine workmanship, durability and comfortable feel. Red base with 1/4in screw hole is compatible with tripod. 4Background Blur Effect: The background blur effect is good, which can create a particularly shallow depth of field effect. The focus is clear and incisive, and the background outside the focus is soft and beautiful, bringing better artistic beauty. It can be used in portrait photography, scenery, tourism, flowers, insects, still life, etc. 5Practical: For iPhone as a reference, the equivalent 50mm focal length effect can be achieved after installing the phone lens, which is visually the same as the SLR camera equipped with a 50mm fixed focus lens (Because the phone lens is an additional lens, the actual imaging focal length is related to the original focal length of phone).